GEOPOLYMERIC CEMENT BASED ON FLY ASH AND HARMLESS TO USE

摘要

Geopolymeric cements based on aluminosilicate fly ash of class F, which, contrary to the prior art, are harmless to use and harden at ambient temperature, favouring their use in common applications in the construction and civil engineering fields. This harmlessness is achieved thanks to a mixture containing: 10 to 15 parts by weight of a non-corrosive alkali metal silicate solution in which the M₂O:SiO₂ molar ratio is less than 0.78, preferably less than 0.69, and the SiO₂:M₂O ratio is greater than 1.28, preferably greater than 1.45, M denoting Na or K; added to this are 10 to 20 parts by weight of water and 5 to 15 parts by weight of blast-furnace slag having a specific surface area of less than 400 m²/kg, preferably less than 380 m²/kg and also 50 to 100 parts by weight of class F aluminosilicate fly ash.